engine INFINITI FX35 2005 Service Manual

TF-10
AWD SYSTEM
Revision: 2005 July 2005 FX
AWD SYSTEMPFP:41650
Power Transfer DiagramADS000RV
System DescriptionADS000RW
DESCRIPTION

Electronic control allows optimal distribution of torque to front/rear wheels to match road conditions.

Makes possible stable driving, with no wheel spin, on snowy roads or other slippery surfaces.

On roads which do not require AWD, it contributes to improved fuel economy by driving in conditions close
to rear-wheel drive.

Sensor inputs determine the vehicle's turning condition, and in response tight cornering/braking are con-
trolled by distributing optimum torque to front wheels.
NOTE:

When driving, if there is a large difference between front and rear wheel speed which continues for a long
time, fluid temperature of drive system parts becomes too high and AWD warning lamp flashes rapidly.
(When AWD warning lamp flashes, vehicle changes to rear-wheel drive conditions.) Also, optional distri-
bution of torque sometimes becomes rigid before lamp flashes rapidly, but it is not malfunction.

If AWD warning lamp is flashing rapidly, stop vehicle and allow it to idle for some time. Flashing will stop
and AWD system will be restored.

When driving, AWD warning lamp may flash slowly if there is a significant difference in diameter of the
tires. At this time, vehicle performance is not fully available and cautious driving is required. (Continues
until engine is turned OFF.)

If the warning lamp flashes slowly during driving but remains OFF after engine is restarted, the system is
normal. If it again flashes slowly after driving for some time, vehicle must be inspected.

When the difference of revolution speed between the front and rear wheel mode the shift occasionally
changes to direct 4-wheel driving conditions automatically. This is not malfunction.
SDIA1611E

TF-12
AWD SYSTEM
Revision: 2005 July 2005 FX
AWD WARNING LAMP
Turns ON when there is a malfunction in AWD system. It indicates that fail-safe mode is engaged and vehicle
change to rear-wheel drive or shifting driving force-AWD (Front-wheels still have some driving torque).
Also turns ON when ignition switch is turned ON, for purpose of lamp check. Turns OFF approximately for 1
seconds after the engine starts if system is normal.
AWD Warning Lamp Indication
System DiagramADS000RX
Condition AWD warning lamp
Lamp check Turns ON when ignition switch is turned ON. Turns OFF
approx. 1 second after engine start.
AWD system malfunction ON
Protection function is activated due to heavy load to electric con-
trolled coupling. (AWD system is not malfunctioning and AWD system
changes to 2WD mode.) Rapid flashing: 2 times/second
(Flashing in approx. 1 minute and then turning OFF.)
Large difference in diameter of front/rear tires Slow flashing: 1 time/2 seconds
(Continuing to flash until turning ignition switch OFF)
Other than above (system normal) OFF
SDIA2160E

AWD SYSTEM TF-13
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Revision: 2005 July 2005 FX
COMPONENTS FUNCTION DESCRIPTION
CAN CommunicationADS000RY
SYSTEM DESCRIPTION
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
For details, refer to LAN-30, "
CAN Communication Unit" .
Component parts Function
AWD control unit

Controls driving force distribution by signals from each sensor and switch from rear wheel driving
mode (0:100) to AWD mode (50:50).

2WD mode is available by fail-safe function if malfunction is detected in AWD system.
Wheel sensors Detects wheel speed.
AWD solenoid Controls electric controlled coupling by command current from AWD control unit.
Electric controlled coupling Transmits driving force to front final drive.
AWD warning lamp

Illuminates if malfunction is detected in electrical system of AWD system.

There is 1 blink in 2 seconds if rotation difference of front wheels and rear wheels is large.

There are 2 blinks in 1 second if load is still applied to driving parts.
ABS actuator and electric unit
(control unit) Transmits the following signals via CAN communication to AWD control unit.

Vehicle speed signal

Stop lamp switch signal (brake signal)
ECM Transmits the following signals via CAN communication to AWD control unit.

Accelerator pedal position signal

Engine speed signal
Unified meter and A/C amp. Transmits conditions of parking brake switch via CAN communication to AWD control unit.

TF-20
TROUBLE DIAGNOSIS
Revision: 2005 July 2005 FX
Trouble Diagnosis Chart for SymptomsADS000S3
If AWD warning lamp turns ON, perform self-diagnosis. Refer to TF-22, "SELF-DIAG RESULT MODE" .
NOTE:
Light tight-corner braking symptom may occur depending on driving conditions. This is not malfunction.
AWD Control Unit Input/Output Signal Reference ValuesADS000S4
AWD CONTROL UNIT INSPECTION TABLE
Specifications with CONSULT-II
Symptom Condition Check item Reference page
AWD warning lamp does not turn ON when
the ignition switch is turned to ON.
(AWD warning lamp check) Ignition switch: ON CAN communication line
TF-33
Unified meter and A/C amp.
Unified meter control unit
AWD warning lamp does not turn OFF sev-
eral seconds after engine started. Engine running CAN communication line
TF-33
Power supply and ground for AWD con-
trol unit
Unified meter and A/C amp.
Unified meter control unit
AWD solenoid
AWD actuator relay (integrated in AWD
control unit)
Wheel sensor
Heavy tight-corner braking symptom occurs
when the vehicle is driven and the steering
wheel is turned fully to either side after the
engine is started. (See NOTE.)

While driving

Steering wheel is
turned fully to either
sides CAN communication line
TF-35Accelerator pedal position signal
AWD solenoid
Mechanical malfunction of electric con-
trolled coupling (clutch sticking etc.)
Vehicle does not enter AWD mode even
though AWD warning lamp turned to OFF. While driving AWD solenoid
TF-36
Mechanical malfunction of electric con-
trolled coupling (Mechanical engage-
ment of clutch is not possible.)
While driving, AWD warning lamp flashes
rapidly. (When flashing in approx. 1 minute
and then turning OFF.)
Rapid flashing: 2 times/second While driving Protection function is activated due to
heavy load to electric controlled cou-
pling. (AWD system is not malfunction-
ing. Also, optional distribution of torque
sometimes becomes rigid before lamp
flashes rapidly, but it is not malfunction.) TF-37
While driving, AWD warning lamp flashes
slowly. (When continuing to flash until turn-
ing ignition switch OFF)
Slow flashing: 1 time/2 seconds
While driving

Vehicle speed: 20 km/h
(12 MPH) or more Tire size is different between front and
rear of vehicle. TF-37
Monitored item [Unit] Content Condition Display value
FR RH SENSOR [km/h] or [mph] Wheel speed (Front wheel
right) Vehicle stopped 0.00 km/h (0.00 mph)
Vehicle running
CAUTION:
Check air pressure of tire under
standard condition. Approximately equal to
the indication on speed-
ometer (Inside of ±10%)
FR LH SENSOR [km/h] or [mph] Wheel speed (Front wheel
left) Vehicle stopped 0.00 km/h (0.00 mph)
Vehicle running
CAUTION:
Check air pressure of tire under
standard condition. Approximately equal to
the indication on speed-
ometer (Inside of ±10%)

TROUBLE DIAGNOSIS TF-21
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Revision: 2005 July 2005 FX
*: The values are changed by throttle opening and engine speed. RR RH SENSOR [km/h] or [mph]
Wheel speed (Rear wheel
right) Vehicle stopped 0.00 km/h (0.00 mph)
Vehicle running
CAUTION:
Check air pressure of tire under
standard condition. Approximately equal to
the indication on speed-
ometer (Inside of ±10%)
RR LH SENSOR [km/h] or [mph] Wheel speed (Rear wheel
left) Vehicle stopped 0.00 km/h (0.00 mph)
Vehicle running
CAUTION:
Check air pressure of tire under
standard condition. Approximately equal to
the indication on speed-
ometer (Inside of ±10%)
BATTERY VOLT [V] Power supply voltage for
AWD control unit Ignition switch: ON Battery voltage
THRTL POS SEN [%] Throttle opening condition When depressing accelerator pedal
(Value rises gradually in response to
throttle position.) 0 - 100%
ETS SOLENOID [A] Monitored value of current at
AWD solenoid Engine running

At idle speed
Approx. 0.000A
Engine running

When depressing accelerator
pedal Approx. 0.000 - 2.400A*
STOP LAMP SW [ON/OFF] Condition of brake pedal
operation Brake pedal: Depressed ON
Brake pedal: Released OFF
ENG SPEED SIG [RUN/STOP] Condition of engine running Engine stopped
(Engine speed: Less than 400 rpm) STOP
Engine running
(Engine speed: 400 rpm or more) RUN
ETS ACTUATOR [ON/OFF] Operating condition of AWD
actuator relay (integrated in
AWD control unit) Engine stopped (Ignition
switch: ON) OFF
Engine running ON
4WD WARN LAMP [ON/OFF] AWD warning lamp condition AWD warning lamp: ON ON
AWD warning lamp: OFF OFF
4WD MODE MON [AUTO] Control status of AWD Engine running AUTO
DIS-TIRE MONI [mm] Improper size tire installed
condition Vehicle running with normal size tire
installed 0-4 mm
Vehicle running with improper size
tire installed (Front/rear tire size dif-
ference, wear condition) 4-8 mm, 8- mm
P BRAKE SW [ON/OFF] Condition of parking brake Parking brake operated ON
Parking brake not operated OFF
Monitored item [Unit] Content Condition Display value

TF-22
TROUBLE DIAGNOSIS
Revision: 2005 July 2005 FX
CONSULT-II Function (ALL MODE AWD/4WD)ADS000S5
FUNCTION
CONSULT-II can display each diagnostic item using the diagnostic test modes shown following.
CONSULT-II SETTING PROCEDURE
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carry out CAN communication.

For details, refer to the separate “CONSULT-II Operations Man-
ual”.
1. Turn ignition switch “OFF”.
2. Connect CONSULT-II and CONSULT-II CONVERTER to data link connector on vehicle.
3. Turn ignition switch “ON”.
4. Touch “START (NISSAN BASED VHCL)”.
5. Touch “ALL MODE AWD/4WD”. If “ALL MODE AWD/4WD” is not indicated, go to GI-39, "
CON-
SULT-II Data Link Connector (DLC) Circuit" .
6. Perform each diagnostic test mode according to each service procedure.
SELF-DIAG RESULT MODE
Operation Procedure
1. Perform “CONSULT-II SETTING PROCEDURE”. Refer to TF-22, "CONSULT-II SETTING PROCEDURE"
.
2. Start engine and drive at 30 km/h (19 MPH) or more for approx. 1 minute.
Diagnostic test mode Function Reference
page
Self-diagnostic results

Self-diagnostic results can be read and erased quickly. TF-22
Data monitor
Input/Output data in the AWD control unit can be read.TF-24
CAN diagnostic support monitor
The results of transmit/receive diagnosis of CAN communication can be read.LAN-18
Active test
Diagnostic Test Mode in which CONSULT-II drives some actuators apart from
the AWD control unit and also shifts some parameters in a specified range. TF-25
ECU part number
AWD control unit part number can be read.
TF-25
PBIB1503E
SAIA0450E
SDIA2216E

TROUBLE DIAGNOSIS TF-23
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Revision: 2005 July 2005 FX
3. Stop vehicle. With engine at idle, touch “SELF-DIAG RESULTS”.
Display shows malfunction experienced since the last erasing
operation.
NOTE:

The details for “TIME” are as follow:
–“0”: Error currently detected with AWD control unit.
–Except for “0”: Error detected in the past and memorized
with AWD control unit.
Detects frequency of driving after DTC occurs (frequency
of turning ignition switch “ON/OFF”).
Display Item List
CAUTION:

If “CAN COMM CIRCUIT [U1000]” is displayed with other DTCs, first perform the trouble diagnosis for CAN communica-
tion line.

Make sure that ABS warning lamp turns OFF by driving for a minute at vehicle speed of 30 km/h (19 MPH) or more after
turning ignition switch "OFF" if AWD warning lamp turns ON with system malfunction of “ABS SYSTEM [C1203]”. AWD
warning lamp may not turn OFF if it is normal unless ignition switch turns OFF at once and engine restarts after that.
How to Erase Self-Diagnostic Results
1. Perform applicably inspection of malfunctioning item and then repair or replace.
2. Start engine and drive at 30 km/h (19 MPH) or more for approx. 1 minute.
3. Make sure that ABS warning lamp turns OFF. NOTE:
Make sure that ABS warning lamp turns OFF by driving for a minute at vehicle speed of 30 km/h
(19 MPH) or more after turning ignition switch "OFF" if AWD warning lamp turns ON with system
malfunction of “ABS SYSTEM [C1203]”. AWD warning lamp may not turn OFF if it is normal unless
ignition switch turns OFF at once and engine restarts after that.
4. Turn ignition switch “OFF” to erase memory.
5. Start engine and select “SELF-DIAG RESULTS” mode for “ALL MODE AWD/4WD” with CONSULT-II.
6. Touch “ERASE” on CONSULT-II screen to erase DTC memory. CAUTION:
If memory cannot be erased, perform applicably diagnosis.
7. Drive at 30 km/h (19 MPH) or more for approx. 1 minute. Be sure AWD warning lamp is OFF.
SDIA2217E
Items (CONSULT-II screen terms) Diagnostic item is detected when... Check item
CONTROLLER FAILURE
[C1201] Malfunction has occurred inside AWD control unit.
TF-27, "
AWD Control Unit"
ABS SYSTEM
[C1203] Malfunction related to wheel sensor has been detected by ABS actu-
ator and electric unit (control unit). TF-27, "ABS System"
4WD SOLENOID
[C1204] Malfunction related to AWD solenoid has been detected.
TF-28, "AWD Solenoid"
4WD ACTUATOR RLY
[C1205] Malfunction has been detected from AWD actuator relay integrated
with AWD control unit, or malfunction related to AWD solenoid has
been detected. TF-31, "AWD Actuator
Relay" or
TF-28, "AW D
Solenoid"
ENGINE SIGNAL 1
[C1210] Malfunction has been detected from ECM. TF-32, "Engine Control Sig-
nal"
CAN COMM CIRCUIT
[U1000] Malfunction has been detected from CAN communication line.
TF-32, "CAN Communica-
tion Line"
NO DTC IS DETECTED.
FURTHER TESTING MAY BE
REQUIRED. No NG item has been detected. —

TF-24
TROUBLE DIAGNOSIS
Revision: 2005 July 2005 FX
DATA MONITOR MODE
Operation Procedure
1. Perform “CONSULT-II SETTING PROCEDURE”. Refer to TF-22, "CONSULT-II SETTING PROCEDURE"
.
2. Touch “DATA MONITOR”.
3. Select from “SELECT MONITOR ITEM”, screen of data monitor mode is displayed. NOTE:
When malfunction is detected, CONSULT-II performs REAL-TIME DIAGNOSIS.
Also, any malfunction detected while in this mode will be displayed at real time.
Display Item List
× : Standard –: Not applicable
Monitored item (Unit) Monitor item selection
Remarks
ECU INPUT
SIGNALS MAIN
SIGNALS SELECTION
FROM MENU
FR RH SENSOR [km/h] or [mph] ××× Wheel speed calculated by front wheel
sensor RH signal is displayed.
FR LH SENSOR [km/h] or [mph] ××× Wheel speed calculated by front wheel
sensor LH signal is displayed.
RR RH SENSOR [km/h] or [mph] ××× Wheel speed calculated by rear wheel
sensor RH signal is displayed.
RR LH SENSOR [km/h] or [mph] ××× Wheel speed calculated by rear wheel
sensor LH signal is displayed.
BATTERY VOLT [V] – – ×Power supply voltage for AWD control unit
THRTL POS SEN [%] – – ×Throttle opening status is displayed.
ETS SOLENOID [A] – – × Monitored value of current at AWD sole-
noid
STOP LAMP SW [ON/OFF] – – × Stop lamp switch signal status via CAN
communication line is displayed.
ENG SPEED SIG [RUN/STOP] – – ×Engine status is displayed.
ETS ACTUATOR [ON/OFF] – – × Operating condition of AWD actuator relay
(integrated in AWD control unit) is dis-
played.
4WD WARN LAMP [ON/OFF] – – × Control status of AWD warning lamp is dis-
played.
4WD MODE SW [AUTO] – – × AWD lock switch is not equipped, but dis-
played.
4WD MODE MON [AUTO] – – ×Control status of AWD is displayed.
DIS-TIRE MONI [mm] – – × Improper size tire installed condition is dis-
played.
P BRAKE SW [ON/OFF] – – × Parking switch signal status via CAN com-
munication line is displayed.
Voltage [V] – – × The value measured by the voltage probe
is displayed.
Frequency [Hz] – – ×
The value measured by the pulse probe is
displayed.
DUTY-HI (high) [%] – –
×
DUTY-LOW (low) [%] – – ×
PLS WIDTH-HI [msec] – – ×
PLS WIDTH-LOW [msec] – – ×

TROUBLE DIAGNOSIS TF-25
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ACTIVE TEST MODE
Description
Use this mode to determine and identify the details of a malfunction based on self-diagnostic results or data
monitor. AWD control unit gives drive signal to actuator with receiving command from CONSULT-II to check
operation of actuator.
Test Item
CAUTION:
Do not continuously energize for a long time.
AWD CONTROL UNIT PART NUMBER
Ignore the AWD control unit part number displayed in the “ECU PART NUMBER”.
Refer to parts catalog to order the AWD control unit.
Test item Condition Description
ETS S/V
(Detects AWD solenoid valve)

Vehicle stopped

Engine running

No DTC detected

Change command current value to AWD solenoid, and then change driv-
ing mode. (Monitor value is normal if it is within approximately ±10% of
command value.)
Qu: Increase current value in increments of 0.20A
Qd: Decrease current value in increments of 0.20A
UP: Increase current value in increments of 0.02A
DOWN: Decrease current value in increments of 0.02A

TF-26
TROUBLE DIAGNOSIS FOR SYSTEM
Revision: 2005 July 2005 FX
TROUBLE DIAGNOSIS FOR SYSTEMPFP:00000
Power Supply Circuit for AWD Control UnitADS000SX
CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE
Data are reference value.
DIAGNOSTIC PROCEDURE
1. CHECK POWER SUPPLY
1. Turn ignition switch “OFF”.
2. Disconnect AWD control unit harness connector.
3. Turn ignition switch “ON”. (Do not start engine.)
4. Check voltage between AWD control unit harness connector ter- minals and ground.
5. Turn ignition switch “OFF”.
6. Check voltage between AWD control unit harness connector ter- minals and ground.
OK or NG
OK >> GO TO 2.
NG >> Check the following. If any items are damaged, repair or replace damaged parts.

10A fuse [No. 12 or 21, located in the fuse block (J/B)]

Harness for short or open between battery and AWD control unit harness connector terminal 9

Harness for short or open between ignition switch and AWD control unit harness connector ter-
minal 7

Ignition switch. Refer to PG-3, "POWER SUPPLY ROUTING CIRCUIT" .
Monitored item [Unit] Condition Display value (Approx.)
BATTERY VOLT [V] Ignition switch: ON Battery voltage
Connector Terminal (Wire color) Voltage (Approx.)
M92 7 (G/R) - Ground
Battery voltage
9 (G/W) - Ground
SDIA2319E
Connector Terminal (Wire color) Voltage (Approx.)
M92 7 (G/R) - Ground 0V
9 (G/W) - Ground Battery voltage
SDIA2320E